4 billion years = 3.50632511 × 1013 hours
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4 years = 35 063.2511 hours
4 years = 35063.3 hours
a number of hours
(4 hours) x (2 days/week) x (52 weeks/year) x (5.5 years) = 2,288 hours
31.71 years (Rounded to 4 significant figures). I used 1,000,000,000 for billion. 1,000,000,000/60 = 16666666.66 (recurring) minutes 16666666.66/60 = 277777.77 /recurring) hours 277777.77/24 = 11574.074 (recurring) days 11574.074/365 = 31.7097... years But on a side note; the German "billion", for instance, has 3 more zeros so you would just have to do the same calculations but with 1,000,000,000,000.